On 09/07/2017 08:11 AM, Stephen John Smoogen wrote:
This was always problematic because DNS hostnames and email addresses in the RFC standards were case insensitive
Not quite. SMTP is required to treat the "local-part" of the RCPT argument as case-sensitive, and to preserve case when relaying mail. The destination is allowed to treat addresses according to local policy, but in general SMTP is case sensitive with regard to the user identifier.
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